Wouters, M. M., Lambrechts, D., Becker, J., Cleynen, I., Tack, J., Vigo, A. G., Ruiz de León, A., Urcelay, E., Pérez de la Serna, J., Rohof, W., Annese, V., Latiano, A., Palmieri, O., Mattheisen, M., Mueller, M., Lang, H., Fumagalli, U., Laghi, L., Zaninotto, G., Cuomo, R., Sarnelli, G., Nöthen, M. M., Vermeire, S., Knapp, M., Gockel, I., Schumacher, J., & Boeckxstaens, G. E. (2014). genetic variation in the lymphotoxin-α (LTA)/tumour necrosis factor-α (TNFα) locus as a risk factor for idiopathic achalasia. Gut, 63(9), 1401–1409. http://access.bl.uk/ark:/81055/vdc_100135153375.0x00003e